Do re -wired BI wired speaker cables need break in time ?

I have a pair of Cardas Clear Beyond speaker cables that were single wired and I had them sent to Cardas to be internally bi-wired. I just got them back on Friday afternoon and they sound dead and muffled and not what they sounded like before. I can't call Cardas today, but if they went from single to b-wired internally do they need to be broken in - all over again ?  Love these cable and it initially took a long time to break them in . Your thoughts and thank you in advance.